Monday’s Supreme Court ruling in Murphy vs. National Collegiate Athletic Association, which extinguished the Professional and Amateur Sports Protection Act of 1992 (PASPA), paved the way for the once unthinkable: legalized gambling in all 50 states.

The ruling has raised many questions, some of them logistical — how will states regulate this new industry, for example — but the thornier issues surround (as always) how the money will get divided. The professional leagues have and will continue to demand a cut of the new revenue legalized gambling generates. And the NCAA could do the same.

Simultaneously, the players’ unions for major sports leagues will also be working to ensure members get a sizeable slice of this new pie. Those negotiations have the potential to upend the labor peace in any (or all) of the major American sports leagues.

Before getting to that possibility, some background on Monday’s ruling: